Elevating form for casting hollow concrete walls



J. T. MCDOWELL LEVATING FORM FOR CASTING HOLLOW CONCRETE WALLS June Sgo,1936.

Filed June '28, 1955 'v ATTORNEY.

Patented June 30, i936 t nrs PAT oFFicE ELEVA'EING FORM, FOR CASTINGHOLLOW CNCRETE WALLSv .ll ames T. McDowell, Denver, Colo.

Application June 28, 1935, Serial No. 28,831

3 Claims. (Cl. .Z5-131) It is desirable under certain conditions to formi3; and maintain the latter in rigid spaced relathe walls of cylindricalconcrete storage bins with tion. Curved beams Il extend entirely aroundvertical air passages throughout the wall area. the form to stiffen theplates l2 and I3. Y Such a construction is shown in copending appli- TheHerameS are spaced apart at Suitable in 5 cation, Serial No. 726,662.tervals around the form, and are supported upon This invention relatesto a concrete form conjack rods I8 which are cast into the concrete andstruction by means of which the vertical passages eXtenOl upwardlytherefrom. A tubular jack shaft in the wall can be continuously formedas the wall I9 Surrounds each 0f the .lack rOdS, and iS held increasesin heighth. from downward movement thereon by means of 10 Another objectof the invention is to combine a ratchet clamp 2t. The jaCk Shaft iSrotated 10 with a vertically traveling mold for casting a conthrough themedium of a head 2l so that it will crete wall means for formingVertical passages thread itself through a nut positioned between withinthe wall so that no additional labor will be the upper GrOSS mellflberslI5. The Cross members involved to cast a wall with passages than one l5Of the frames are Carried U-DOrl the tubular without such passagesthreaded shafts I9 so that rotation of the latter` 15 Other objects andadvantages, reside in the will lift the frames on the rods I8. detailconstruction of the invention, which is Thus, after the section of wallbetween the designed for simplicity, economy, and eiiiciency, forms I2and I3 has been poured and set, the These will become more apparent fromthe foljack shafts I9 are rotated to lift the two forms lowingdescription. I2 and I3 upwardly to a position to receive the 20 In thefollowing detailed description of the in neXt POU-ring 0fC011Cretevention reference is had to the accompanying The hollow airpassages II are cast by means drawing which forms a part hereof. Likenuof core forms 22 which are suspended from rods merals refer to likeparts in all views of the 23 intermediate the fOrrn plates l2 and I3.The 25 drawing and throughout the description. rods 23 pass through andare suspended from 25 In the drawingzbeams 2e extending between thecross members Fig. 1 is a horizontal section through a typical I6 ofadjacent frames. A circular angle bar 25 circular bin having Verticalair passages of the extends entirely around the structure between typewhich this invention is designed to form. the forms I2 and I3 and issecured to each of the Fig. 2 is a perspective View of a portion of thecore forms 25, so as to maintain them in their 30 cylindrical bin wallillustrating the improved conproper Spaeed relation lOetWeen` the formplates I2 crete form in place thereon. and I3. The core forms 22 mayhave any desired Fig. 3 is a side elevation of the core formemconstruction. It is preferred to form them of ployed in thisinvention, partially broken away to wood, as illustrated in Figs. 3 and4, with hollow show the interior construction. v interiors and with eachform suspended from a 35 Fig. 4 is a. horizontal cross section throughthe pair of the rods 23. The length 0f the Core form core form of Fig.3, taken on the line 4 4, Fig. 3, is substantially equal to the width ofthe form In the drawing a typical circular concrete bin plates I2 andI3. wall is indicated at I0 provided with a series of It can be readilyseen that as the frames move vertical, spaced-apart air passages l I.The pres.- upwardly, they will also lift the core forms 22 so 40 entinvention is designed to cast the complete that the latter Will travelSimultaneously with the wall I0, with its air passages II, and to ascendmovement of the entire form, with the rising wall so as to form anascending With this construction, a hollow wall having form therefor tothe top of the structure. vertical air passages may be cast just asreadily The improved form comprises an inner form and just aS rapidly asa Solid Wall Since the core 45 plate I2 and an outer form plate I 3. Theplates forms interfere in no way with the usual wall I2 and I3 arecircular, the inner plate forming the pouring procedure. inner diameterof the desired structure and the While the invention has been describedas parouter plate I3 forming the outside diameter of ticularlyapplicable to casting a circular wall the finished structure. The twoplates are mainsuch as used in storage elevator bins and the like, 50tained concentric with each other by means of it is of course notlimited to this particular use, H-frames having vertical side members I4tied but can also be used for casting a straight, holtogether by upperand lower cross members I5 low wall. and I6, respectively. The legs ofthe H-frames I4 While a speciiic form of the improvement has extenddownwardly over the form plates I 2 and been described and illustratedherein, it is de- 55 sired to be understood that the same may be varied,within the scope of the appended claims, without departing from thespirit of the invention.

Having thus described the invention, what is claimed and desired securedby Letters Patent 1s:-

1. An elevating form for continuously casting a hollow concrete wallcomprising: a pair of H- frames, the legs of which extend downwardlyover each face of' said wall, an inner form plate extending between thelegs on the inner face of the wall; an outer form plate extendingbetween tljle legs on the outer face of the wall; a cross beam extendingbetween said H-frames over said Wall; a series of pairs of vertical rodsextending downwardly from said cross beams; and aV core form surroundingeach pair of rods between said face plates.

2. An elevating form for continuously ,casting a hollow concrete wallcomprising: a pair of H- frames the legs of which extend downwardly overeach face of said wall, an inner forni plate extending between the legson the inner face of the wall; an outer form plate extending between thelegs on the outer face of the Wall; a cross beam extending between saidH-frames over said Wall; core forms suspended from said cross beambetween said faceplates; means for elevating said H- frames; and a tiemember secured to and extending between the upper extremities of all ofsaid core forms.

3. In an elevating form for casting concrete Walls, said form consistingof lH-frarnes connected by inner and outer wall form plates, means forsupporting core forms therein comprising: a horizontal beam extendingbetween said H- frames; a series of spaced-apart core forms; a pair of`vertical parallel suspension bolts extending upward from each of saidcore forms through said beam; and a longitudinally extending tie membersecured to each of said core forms and extending along their upperextremities below said beam, said bolts being suiciently long to suspendsaidrcore forms a substantial distance below said beam so as not tointerfere with the pouring of said forms.

JAMES T. MCDOWELL.

